Ionosphere

The ionosphere (/aɪˈɒnəˌsfɪər/)^[1][2] is the ionized part of the upper atmosphere of Earth. Closest to the surface of Earth, the ionosphere is about 48 km (30 mi) away. It goes on up to 965 km (600 mi) above sea level.^[3]

1. ↑ Jones, Daniel (2003) [1917]. "ionosphere". In Peter Roach; James Hartmann; Jane Setter (eds.). English Pronouncing Dictionary. Cambridge: Cambridge University Press. ISBN 978-3-12-539683-8.
2. ↑ "Ionosphere". Merriam-Webster Dictionary.
3. ↑ Zell, Holly (2 March 2015). "Earth's Atmospheric Layers". NASA. Retrieved 2020-10-23.